The contents of the file wrapper as an opaque data object.
- iOS 4.0+
- macOS 10.0+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
This property may be
nil if the user modifies the contents of the file system node after you call
init(url:, but before
File has read the contents of the file. You can use the
immediate reading option to reduce the likelihood of this problem.